import java.util.*;

/*
 * public class ListNode {
 *   int val;
 *   ListNode next = null;
 *   public ListNode(int val) {
 *     this.val = val;
 *   }
 * }
 */

public class Solution5 {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param pHead1 ListNode类 
     * @param pHead2 ListNode类 
     * @return ListNode类
     */
    public ListNode Merge (ListNode pHead1, ListNode pHead2) {
        // write code here
        if(pHead1 == null) {
            return pHead2;
        }
        if(pHead2 == null) {
            return pHead1;
        }
        ListNode dum = new ListNode(0);
        ListNode cur = dum;
        while(pHead1 != null && pHead2 != null) {
            if(pHead1.val < pHead2.val) {
                cur.next = pHead1;
                pHead1 = pHead1.next;
            } else {
                cur.next = pHead2;
                pHead2 = pHead2.next;
            }
            cur = cur.next;
        }
        if(pHead1 != null) {
            cur.next = pHead1;
        }
        if(pHead2 != null) {
            cur.next = pHead2;

        }
        return dum.next;
    }
}